I got a FREE 2013 iMac 21.5 with internal upgrades including Samsung evo ssd and 16gigs of ram. Then used open legacy patcher to install Mac OS Venture 13.5 beta. : r/osx
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
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21.5" iMac Mid-2014 1TB SATA SSD Upgrade – UKSL MacLab
iMac Intel 21.5" EMC 2638 Blade SSD Replacement - iFixit Repair Guide
iMac (21.5-inch, Late 2013) 1TB SSD Upgrade - NiwTech
2013 iMac teardowns reveal SSD slots, soldered-in CPU in the 21.5” model | Ars Technica
OWC SSD Upgrade Kits for 21.5-Inch iMac (2013 - 2019)
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Amazon.com: OWC SSD Upgrade Bundle for 2012-2019 21.5" iMacs, Mercury Electra 1.0TB 6G SSD, Express 2.5" USB 3.0 HDD Enclosure, Installation Tools and iMac Screen Adhesive Tape Set : Electronics
Amazon.com: Odyson - 256GB SSD Upgrade Kit Replacement for iMac 21.5" A1418 (Late 2013-Mid 2014) : Electronics
How to Upgrade/Replace the PCIe SSD in a 21.5-inch iMac (Late 2013) on Vimeo
How to Upgrade iMac Hard Drive or SSD 2012-2022: EveryMac.com
How to Speed up your iMac with a NVMe 960EVO M.2 SSD - YouTube
iMac 2013 (and later) with NVME SSD? | MacRumors Forums
iMac (27-inch, Late 2013) HDD --> SSD upgrade | MacRumors Forums
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OWC SSD Upgrade Kits for 21.5-Inch iMac (2013 - 2019)
Amazon.com: Sintech M.2 nVME SSD Adapter Card Upgrade Kits,Compatible for MacBook Air(2013-2017 Year) and MacBook PRO（Late 2013-2015 Year,iMac : Electronics
OWC SSD Upgrade Kits for 21.5-Inch iMac (2013 - 2019)
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